S6 4kW Dual MPPT - Single Phase With DC
Solis S6 4kW Dual MPPT - Single Phase With DC
S6 4kW Dual MPPT - Single Phase With DC
Solis S6 Dual MPPT — Two trackers, so a split roof stops costing you generation.
A second MPP tracker is the single most useful upgrade on a British roof, and the reason is geometry rather than electronics. Very few UK houses offer one clean, unshaded, south-facing pitch. Most offer two pitches at different angles, or one pitch with a chimney, a dormer or a neighbour's tree across part of it. Wire that array as a single string and every panel is dragged down to the performance of the worst one.
Please read before ordering
About the Solis S6 Dual MPPT
The Solis S6 Dual MPPT range gives each pitch, or each shaded group, its own tracker and its own maximum power point. East and west arrays generate independently across the day, and a shaded group no longer taxes the clear one. In practice that is the difference between a roof being worth doing and being marginal.
The range runs from 2.5 kW to 6 kW in seven steps, all in the same 310 × 543 × 160 mm case at 11 to 12 kg, all IP66, and all with integrated AFCI arc-fault detection. The larger models accept up to 14 A per tracker, which is enough headroom for current large-format and bifacial modules rather than only for the 400 W panels of a few years ago.
String design, certification and what is in the box
The details that decide whether this unit suits the job:
- Two independent MPP trackers, one string each, 14 A per tracker — sized for modern high-current modules including bifacial.
- Integrated AFCI (activation required) and integrated Export Power Manager.
- The SKUs we stock include the integrated DC switch, so no separate rooftop or wall isolator is needed.
- G98 and G99 certified with EN 50549-1; the certificates are attached to the listing.
- The 4 kW to 6 kW models start at 120 V with a 90 – 520 V MPPT window; the 2.5 kW and 3 kW start at 60 V with a 50 – 450 V window, which allows notably shorter strings on small pitches.
Where this inverter earns its place
The S6 Dual MPPT is specified most often for these jobs.
Can I add a battery to this?
This is a grid-tied PV inverter. It converts solar DC into AC for the property and the grid, and it has no battery port. That is not a shortcoming — it is the right architecture for a system without storage, and it is why it costs what it does.
If storage is on the roadmap, you have two routes. Add an AC-coupled battery system alongside this inverter later, which works with any PV inverter and needs no change to what is already installed. Or choose a hybrid inverter now and pay for a battery port you will use in a year or two. We are happy to talk that trade-off through before you order.
Solis S6-GR1P4K technical data
Ordered with this inverter more often than anything else
An inverter on its own rarely completes the job. These are the parts our customers add most often:
Questions we get asked about this inverter
What does a second MPPT actually gain me?
On a genuinely single-orientation, unshaded roof, nothing. On a split or partly shaded roof it is typically a double-digit percentage of annual yield, because each string finds its own optimum instead of being averaged with the other.
Can I put both strings on one tracker?
You can, but then you have bought a dual-tracker inverter and used it as a single. If both pitches face the same way with the same shading it makes no difference; if they do not, split them.
Do I still need optimisers?
Usually not. Two trackers handle two orientations or one shaded group. Optimisers earn their money when shading is per-panel and moves across the array — a chimney shadow tracking across a roof through the day, for instance.
Is the DC isolator included?
Yes on the models we stock. It is integrated in the inverter.
Is it battery ready?
No. This is a grid-tied PV inverter with no battery port. If storage is on the roadmap, either plan an AC-coupled battery or choose a hybrid inverter now.
How loud is it?
It is convection cooled with no fan, so effectively silent. It can go on a hallway or bedroom wall without complaint.
Documents, advice and trade pricing
Every datasheet, certificate, installation manual and warranty document we hold for this product is in the Documents tab below. See the rest of our inverter range and our solar panels, or email our sales team at sales@clearraysolar.com if you would like us to check a string design or a compatibility question before you order.
Three figures govern it, all in the Technical Specifications: the MPPT voltage range, the maximum input voltage and the maximum DC power. Tell us which panel you're pairing it with and we'll confirm the string layout.
G98 covers installations up to 3.68kW per phase and is notified to your DNO after commissioning. Anything larger needs G99 approval agreed beforehand. We can flag which one your design falls under.
A hybrid inverter takes a DC-coupled battery directly. A standard string inverter needs an AC-coupled battery alongside it. The Technical Specifications show which type this unit is.
Yes, up to the maximum DC power figure in the specifications. Modest oversizing is normal practice - it lifts output in winter and at either end of the day, at the cost of brief clipping at midday peak.
An MPPT tracks the optimum operating point for a string of panels. You want one per roof orientation or pitch, because panels facing different directions on a single tracker drag each other down.
The standard manufacturer warranty is listed under the Warranty tab. Extended cover is available on most brands - see Warranty Extensions.
Build your complete solar system
Everything you need in one place.
- Inverters
- Batteries
- Mounting Systems
- Cabling & Accessories
- Protection Devices
Delivery times vary by region:
- UK — 1-2 business days
- Highlands & Islands — 1-2 business days
Returns accepted within 14 days of delivery for unused items in original packaging.
